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Old 02-19-2013, 09:13 AM   #21
Terra Nova
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Default Re: Synthetic Oil?

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Originally Posted by Weeman View Post
To each their own but I couldn't justify a $60 royal purple or redline oil change for an Astra. You guys must be made of cash

In my area pennzoil, mobil 1 and castrol synthetic are reasonably priced but RP and redline are $12.99+ a liter!
I'm in your area as well....and with my preferred discount, I get the Amsoil Group 4 100% synthetic 5W30 for $8.40 a liter.

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Old 02-19-2013, 12:32 PM   #22
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Default Re: Synthetic Oil?

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Originally Posted by Weeman View Post
To each their own but I couldn't justify a $60 royal purple or redline oil change for an Astra. You guys must be made of cash

In my area pennzoil, mobil 1 and castrol synthetic are reasonably priced but RP and redline are $12.99+ a liter!
Your shopping at the wrong place Let me guess CT.?

its cheaper here https://sites.google.com/a/performan...yal-purple-oil

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Old 02-21-2013, 03:54 PM   #23
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Default Re: Synthetic Oil?

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Originally Posted by Terra Nova View Post
How many miles do you typically go between oil changes when using Amsoil for your cars ?
The top of the line Amsoil say they don't need changing for 25,000 miles. Take it for whats its worth, I would never wait that long, I do wait a little longer than you should though, depending on cars, the Astra is about 6-8K before we do it or at least once a winter, once a summer, and in between if there are lots of miles. Our Dodge Journey says to do it every 3k no way, we do it ever 8K as well even thought the stupid change oil light comes on every 3K. For my Motorcycle I do it before winter storage, after winter storage and at least twice during the summer, which is about 2-3k a summer on the bike.

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Old 02-24-2013, 11:23 AM   #24
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Default Re: Synthetic Oil?

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Originally Posted by Burgandy25 View Post
The top of the line Amsoil say they don't need changing for 25,000 miles. Take it for whats its worth, I would never wait that long, I do wait a little longer than you should though, depending on cars, the Astra is about 6-8K before we do it or at least once a winter, once a summer, and in between if there are lots of miles. Our Dodge Journey says to do it every 3k no way, we do it ever 8K as well even thought the stupid change oil light comes on every 3K. For my Motorcycle I do it before winter storage, after winter storage and at least twice during the summer, which is about 2-3k a summer on the bike.
I'm with you.....I'd never go more than 9,000 miles myself.

I opt for a good GRP IV oil like Amsoil simply because it's a better oil - i.e robust additives, better cold & hot condition specs, etc.- so while it may be a fact that it allows for much longer oil change intervals, it's not really a relevant fact for me.

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Old 02-25-2013, 02:09 AM   #25
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Default Re: Synthetic Oil?

Its strange that the Astras oil life computer says 11,000 miles when you reset the oil life. I just reset ours this weekend for the first time and it says 11,000 or 10,000 I cant remember, thats awfully long for an oil change in such a small engine at that.

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Old 02-25-2013, 03:48 AM   #26
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Default Re: Synthetic Oil?

Cars are much easier on oil than they used to be, engines wear slower, and oils are better than they used to be. No reason you can't go 11,000 miles on one oil change.

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Old 02-25-2013, 09:16 AM   #27
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Default Re: Synthetic Oil?

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Originally Posted by vanilla sky View Post
Cars are much easier on oil than they used to be, engines wear slower, and oils are better than they used to be. No reason you can't go 11,000 miles on one oil change.
It's interesting...my shop's been in business for over 25 years, and they've noticed a marked increase in engine oil consumption and premature timing chain wear / failures among customers who have followed the Oil Life Monitors when doing oil changes.

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Old 02-25-2013, 10:47 AM   #28
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Default Re: Synthetic Oil?

i used to be a big believer in gm oil life monitor when it came out in the 90s but with todays more complicated engines its caused alot of problems. most monitors have been reset by gm to only go to 7500 miles then flash oil change. they have had so much trouble all gm cars 2011 and newer are required to use semi synthetic or no warranty.

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Old 02-25-2013, 05:19 PM   #29
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Default Re: Synthetic Oil?

People also treat timing chains like they aren't wear items (they are).

Fact is that these cars aren't built well enough to outlast their engines. They'll die of gross neglect or crashes before they get tossed away because their engines simply wore out.

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Old 12-06-2017, 11:32 AM   #30
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Default Re: Synthetic Oil?

I changed the oil on my 100,000 mile '99 SL2 last week, topping off my last 2 quarts of Pennzoil natural w 2 quarts of NAPA, w turned out to be a synthetic made by Valvoline. When I got back from my 2nd 100mile high-speed road trip since the oil-change the car was huffing & puffing & blowing steam like on old-fashioned IronHorse, so I'm wondering if synthetic & natural don't mix(the car was running perfectly b4(except for the transmission)). Perhaps the synthetic loosened up alot of sludge w is now clogging the filter causing overheating by diminishing oil-flow? Can I change the filter w/o changing the oil (i.e.how much will run out when I remove the filter)?

TIA

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Old 12-06-2017, 01:01 PM   #31
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Default Re: Synthetic Oil?

Tried reading labeling on oil containers? If I'm not mistaken synthetic and regular oil are compatible and can be mixed without issues. It's more likely coincidence when the engine decided to act differently. There's no harm in replacing the oil filter and you'll lose only the amount in the filter, less than a pint. Something else is going on with your engine. You might as well post a new thread about it.

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Old 12-06-2017, 10:07 PM   #32
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Default Re: Synthetic Oil?

I ran my car on synth and conventional for a bit, and i have no noticeable engine problems

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Old 12-06-2017, 11:20 PM   #33
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Default Re: Synthetic Oil?

Quote:
Originally Posted by jackrcurtis View Post
I changed the oil on my 100,000 mile '99 SL2 last week, topping off my last 2 quarts of Pennzoil natural w 2 quarts of NAPA, w turned out to be a synthetic made by Valvoline. When I got back from my 2nd 100mile high-speed road trip since the oil-change the car was huffing & puffing & blowing steam like on old-fashioned IronHorse, so I'm wondering if synthetic & natural don't mix(the car was running perfectly b4(except for the transmission)). Perhaps the synthetic loosened up alot of sludge w is now clogging the filter causing overheating by diminishing oil-flow? Can I change the filter w/o changing the oil (i.e.how much will run out when I remove the filter)?

TIA
I would suggest posting in the SL2 forums, us Astra folks don't have very much in common with your model. You may get some better answers over there, probably also more people looking the posts.

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Old 12-12-2017, 08:03 PM   #34
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Happy Re: Synthetic Oil?

I'm old-fashioned like brigs but I changed the oil on my 100,000 mile '99 SL2 last week, topping off my last 2 quarts of Pennzoil natural w 2 quarts of NAPA, w turned out to be a synthetic made by Valvoline. When I got back from my 2nd 100mile high-speed road trip since the oil-change the car was huffing & puffing & blowing steam like on old-fashioned IronHorse, so I'm wondering if synthetic & natural don't mix(the car has always run perfectly b4(except for the transmission)). Perhaps the synthetic loosened up alot of sludge w is now clogging the filter causing overheating by diminishing oil-flow? Can I change the filter w/o changing the oil (i.e.how much will run out when I remove the filter)?

TIA

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Old 12-12-2017, 10:59 PM   #35
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Default Re: Synthetic Oil?

I've been running with plain old Motomaster 5W-30 motor oil in both of my vehicles....only $15 (on sale) for 5L and I change the oil when the OLM recommends. Seems to work well for me.

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Old 12-13-2017, 12:06 AM   #36
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Default Re: Synthetic Oil?

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I've been running with plain old Motomaster 5W-30 motor oil in both of my vehicles....only $15 (on sale) for 5L and I change the oil when the OLM recommends. Seems to work well for me.
Of course it works well for you. Because its certified oil. There's no reason why any certified oil shouldn't work well for anyone under normal circumstances. The whole oil debate is a huge fandangle. I admit, I use synthetic oil, but I only buy it on sale. I figure why not spend a few extra dollars, for supposed extra protection, for a bit of peace of mind. But really, if you do your regular oil changes, it doesn't matter what oil you use so long as it meets the standards. Anyone who thinks otherwise that isn't doing some sort of hard racing, is delusional.

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Old 12-14-2017, 12:49 PM   #37
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Default Re: Synthetic Oil?

As I have said elsewhere, I prefer Valvoline products. I am sure Pennzoil, Mobil1 and others make equivalent or better products at this price-point or for more, but I have the example Valvoline has shown on sponsorship of friends who race and have nothing but good things to say about their representatives and company bigwigs upon meeting them at events all around the country.

I have found one can get synthetic oil for the same or even better price if you keep your eyes open. In the internet age, that means using the search tools on Amazon, Jet.com, or the "Honey" app out there always looking for you so you can find the best price. For this and other products, you have to be open to a myriad of notifications as the results come in. One way I used to deal with this is to have this type of function limited to just one of my computers that was on all of the time, but the email part of the notification process got too much. Nowadays, I have a junk email account associated with that activity, as well as it happening on a different browser (ie. Opera, Mozilla, etc.) to limit my interaction until I want to shop.

Attached is a recent result on Jet.com (owned by Walmart). Also please find what I think is the best short video explanation of why synthetic oil is better under all circumstances.

Video: https://www.youtube.com/watch?v=tYkg0oDUXs8
Attached Images
File Type: png Screenshot 2017-12-14 at 7.50.55 AM.png (61.8 KB, 9 views)

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