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Old 04-11-2011, 12:11 PM   #1
Joshtheclockman
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Default 20w50 oil?

I couldn't find anything on the subject before so i decided to ask. Would it be a good idea to put 20W50 oil in my Saturn during the summer? I too have the magically disappearing oil problem but it seems to be worse during the summer when we will get the 90+ degree weather everyday, and its been recommended to me to use 20W50 instead of the 10w40 iv been using...



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Old 04-11-2011, 12:46 PM   #2
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Default Re: 20w50 oil?

The general consensus is no. Despite the increase in oil pressure, the flow rate (especially through the oil filter) will be killed. Even when the engine gets hot. You are also going to be paying for it in gas (reduce fuel economy).

Don't be discouraged though, there are a small number of ways to reduce oil consumption inexpensively. Perhaps do a search for "MMO soak" or "MMO treatment".

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Old 04-11-2011, 03:50 PM   #3
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Default Re: 20w50 oil?

I tried 20W-50 once for one oil change cycle. It made no difference in the oil consumption. +1 on the MMO soak - it only costs a few dollars and might help some.

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Old 04-11-2011, 10:19 PM   #4
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Default Re: 20w50 oil?

Quote:
Originally Posted by SaturnFix View Post
The general consensus is no. Despite the increase in oil pressure, the flow rate (especially through the oil filter) will be killed. Even when the engine gets hot. You are also going to be paying for it in gas (reduce fuel economy).

Don't be discouraged though, there are a small number of ways to reduce oil consumption inexpensively. Perhaps do a search for "MMO soak" or "MMO treatment".
hate to say this, but +1 to this guy...

especially in the winter time when you use 20w-30 and it'll be so thick you'll wear down your engine quicker due to the heavier weight..

oh yeah, seafoam is fine too when it comes to soaks/treatment; don't be discouraged though if it doesn't help or makes it worse, as it's a hit or miss thing really.

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Old 04-11-2011, 11:19 PM   #5
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Default Re: 20w50 oil?

Quote:
Originally Posted by Joshtheclockman View Post
I couldn't find anything on the subject before so i decided to ask. Would it be a good idea to put 20W50 oil in my Saturn during the summer? I too have the magically disappearing oil problem but it seems to be worse during the summer when we will get the 90+ degree weather everyday, and its been recommended to me to use 20W50 instead of the 10w40 iv been using...



1994 sl 5spd 171,000
As has been said by others, the 20w-50 is far outside of the desired band at any temperature, don't try it. You will have better luck using a name brand 5w-40 instead of the 10w-40 also. It is a good idea to clean the cam cover to head joint area with clean rags and brake cleaner until it is completely clean and the start the engine and allow it to sit and idle until it has reached normal operating temperature. Then turn it off and allow it to cool slightly. Then take a folded up pad of toilet paper and gently wipe small sections of the cam cover/head joint area and check the paper for fresh oil. You can not see an oil leak by just looking. The paper will make it stand out so you can see it. The amount of oil that can leak out of a cam cover is considerably more than you would believe.

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Old 04-12-2011, 06:13 PM   #6
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Default Re: 20w50 oil?

I have started using 5W-50 (Castrol full synthetic), I had been using 10w-30 but after doing the MMO soak a couple of times along with the fixed orfice PCV, my oil consumption has gone down considerably.

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Old 04-12-2011, 09:03 PM   #7
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Default Re: 20w50 oil?

So it sounds like 20w50 isn't such a great idea, so i won't even mess with it.

Thanks to everyone who posted

MMO soak sounds like fun, trying to confirm that I wont do any more harm to it than there already is

I have no idea how quickly the car goes through oil either, so i' got to figure that out too, i check it before i use the car mainly everyday but never really kept track of mileage.

Is there an alternative to actually putting the mmo in the spark plug holes and waiting for 8 hours? I really don't want to be stuck without a car for that long.

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Old 04-12-2011, 09:08 PM   #8
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Default Re: 20w50 oil?

First thing to do is check for leaks and correct them and then figure out exactly how much oil you are using with the brand of oil you want to start using. My guess is you are leaking as much as you are burning.

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Old 04-12-2011, 11:00 PM   #9
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Default Re: 20w50 oil?

Quote:
Originally Posted by Joshtheclockman View Post
Is there an alternative to actually putting the mmo in the spark plug holes and waiting for 8 hours? I really don't want to be stuck without a car for that long.
The alternative is to use a harsher, overpriced GM brand cleaner for 2-4 (?) hours.

...
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Old 04-13-2011, 08:58 AM   #10
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Default Re: 20w50 oil?

Quote:
Originally Posted by Joshtheclockman View Post
Is there an alternative to actually putting the mmo in the spark plug holes and waiting for 8 hours? I really don't want to be stuck without a car for that long.
next time you plan on chainging the oil, go home, remove the spark plugs with the engine warm before going to bed and pour in your MMO and cover the holes. Roatate it a couple of times by hand and go to bed.

Next morning, pull the PCM-B fuse, crank it a few times to expel remaining MMO, repalce the plugs and fuse and fire it up, then change your oil. You are only without the car the amount of time it takes to replace the plugs in the morning

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Old 04-13-2011, 04:24 PM   #11
Joshtheclockman
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Default Re: 20w50 oil?

Very nice, I should've thought of that! i will try doing that when i change my oil here in a couple days. The mmo soak cant hurt anything can it?


....To my knowledge I have no more oil leaks but i could be wrong, i replaced the valve cover gasket, maybe in the fall of last year, that defiantly helped a lot. But I will check again here again come the weekend.


Thank you all so much for all the help

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Old 04-13-2011, 04:36 PM   #12
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Default Re: 20w50 oil?

and also when doing the mmo soak i never like to put plugs back into a warm engine even a turn or two so i just put the plug boots back into the holes to cover them up just my 2 cents.

i've also been using the 10w-40 full syn rotella and it seems to be working out nicely as far as oil consumption and no lifter noise on start up. But it does not get that cold here in ca where i live and summer is a coming 100+ .

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Old 04-16-2011, 02:38 PM   #13
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Default Re: 20w50 oil?

Just a note about removing plugs from a hot engine. DON"T
The operative word is Warm, and even then you run risks of head gasket problems, warped heads, and warped spark plug holes.

Any good mechanic will always wait for the engine to cool down before removing a spark plug from any engine.

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Old 04-18-2011, 03:41 PM   #14
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Default Re: 20w50 oil?

I wouldn't ever work on a hot engine even on a bet just because being burnt really doesn't sound like a fun thing to do. Since the spark plugs happen to be just above the exhaust i wont mess with them for at least 45 mins after the car has been driven. But it tis good information to know.

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Old 04-18-2011, 03:50 PM   #15
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Default Re: 20w50 oil?

Quote:
Originally Posted by Joshtheclockman View Post
I wouldn't ever work on a hot engine even on a bet just because being burnt really doesn't sound like a fun thing to do. Since the spark plugs happen to be just above the exhaust i wont mess with them for at least 45 mins after the car has been driven. But it tis good information to know.
I'd give it at least an hour and a half to two hours before R&R'ing the spark plugs. Bonus points if you ever have to work on an engine where half the plugs are blocked off by the intake manifold -- you also have to drain the coolant, which, again, should be done on a cold engine.

as for removing them when warm and there's a chance of warping/cracking the head (gasket): by that logic, any time I need to do a warm compression test, I run the risk of doing something wrong to the engine?

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Old 04-18-2011, 04:35 PM   #16
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Default Re: 20w50 oil?

If you're going to do this, COVER the spark plug holes.. Either with the plugs or with shop rags. You do NOT want something crawling in there. Baked crushed spider in a cylinder will probably not be good times.

P.

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Old 04-18-2011, 11:12 PM   #17
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Default Re: 20w50 oil?

Quote:
Originally Posted by adventureoflink View Post
as for removing them when warm and there's a chance of warping/cracking the head (gasket): by that logic, any time I need to do a warm compression test, I run the risk of doing something wrong to the engine?
Aluminum threads of course softer when hot. When in doubt, simply crack the pugs loose when cold. Then you're good to go. Anti-seize ftw.

...
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