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#2663167 - 06/23/12 10:46 PM My mechanic put 20w-50 in my car.
vincent714028 Offline


Registered: 03/04/07
Posts: 23
Loc: Alabama
It's a 94 camaro v8. A shadetree mechanic put a used engine with 160000 miles in my car. He filled it with Castrol GTX 20w-50. I think that is too thick and would like to try a thinner oil like 5w-30 since that is what is speced for my car.

I don't want to waste this oil so would it do any harm to leave it in for 3-5000 miles?
_________________________
2011 Mazda 3
1994 Chevrolet Camaro Z28

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#2663173 - 06/23/12 10:50 PM Re: My mechanic put 20w-50 in my car. [Re: vincent714028]
daves87rs Online   content


Registered: 02/23/09
Posts: 14548
Loc: Michigan
Can't hurt....
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“The Only Thing Necessary for the Triumph of Evil is that Good Men Do Nothing.”

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#2663177 - 06/23/12 10:52 PM Re: My mechanic put 20w-50 in my car. [Re: vincent714028]
TFB1 Offline


Registered: 09/03/10
Posts: 2894
Loc: VA
In 'bama, in the Summer, it'll be fine...

If past OCI are unknown keep a eye on the level and color of the oil, if it gets dark early, you want to consider this oil a flush and do another change in 1.5-2Kmi...

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#2663183 - 06/23/12 10:56 PM Re: My mechanic put 20w-50 in my car. [Re: vincent714028]
Chris142 Offline


Registered: 06/05/03
Posts: 12741
Loc: apple valley, ca
I'd run it a couple thousand miles then drain it. Kinda use it as a flush. 20w50 is still very popular here.
_________________________
02 Wrangler durablend 10w40
87 F250 Diesel Mystic 15w50
04 Tahoe super-s 5w30
Z400 Lucas 10w30
KLR250 Maxima 10w40
Polaris Trailblazer delo 5w40

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#2663188 - 06/23/12 11:01 PM Re: My mechanic put 20w-50 in my car. [Re: vincent714028]
DragRace Offline


Registered: 11/27/06
Posts: 2327
Loc: 1/4 Mile Track
Originally Posted By: vincent714028
It's a 94 camaro v8. A shadetree mechanic put a used engine with 160000 miles in my car. He filled it with Castrol GTX 20w-50. I think that is too thick and would like to try a thinner oil like 5w-30 since that is what is speced for my car.

I don't want to waste this oil so would it do any harm to leave it in for 3-5000 miles?


No reason for that heavy of an oil in that motor,period.

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#2663195 - 06/23/12 11:10 PM Re: My mechanic put 20w-50 in my car. [Re: vincent714028]
crazyoildude Offline


Registered: 07/23/08
Posts: 6930
Loc: new jersey
change to a 5w30 or 10w30 before the winter

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#2663200 - 06/23/12 11:15 PM Re: My mechanic put 20w-50 in my car. [Re: vincent714028]
deven Offline


Registered: 06/28/05
Posts: 2602
Loc: Massachusetts
find a new mechanic
_________________________
REAL MEN TEAR DOWN ENGINES TO LOOK AT OIL PERFORMANCE. THE REST ANALYZE IT FROM PIECE OF PAPER(S).

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#2663202 - 06/23/12 11:17 PM Re: My mechanic put 20w-50 in my car. [Re: vincent714028]
JimPghPA Offline


Registered: 08/22/09
Posts: 2949
Loc: Pittsburgh,PA U.S.A.
20W-50 in a GM 8 cylinder with 160 K miles is a good summer oil. It might cost you a little in MPG's, but with 160 K miles any XW-30 oil is probably too thin. Often when you get that kind of miles on a old GM 8 cylinder you have to use a 40 or a 50 grade as the top number.

I have Castrol GTX 20W-50 in my 1985 Olds Delts 88 with over 160 K miles on it. I had to go to something thicker than a XW-30 because it burned and leaked 30 too fast, and it would sometimes stall on a very hot day. With the 20W-50 I do not have to add oil as often, and I do not have to smell the leaking oil burning off, and it does not stall on hot days.

With that kink of miles the clearance between parts is more than it was when new, and a thicker oil works better.

I am thinking of going with something like the newer 5W-50 oil for winter. Right now with a 20W-50 in it, 15 Fahrenheit is about the coldest that I would have the temperature be and still try to start it.
_________________________
Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa


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#2663203 - 06/23/12 11:18 PM Re: My mechanic put 20w-50 in my car. [Re: vincent714028]
Lead Shoes Offline


Registered: 03/03/10
Posts: 2431
Loc: Mn
Find a new mechanic...

The only time that motor NEEDS 20w50 is under long track sessions, but seeing as it is already in there I would run it out for a few thousand miles though, then change to 5w30.
_________________________
1992 BMW 325i M50b25 170k
Cenex 5w40 HDEO/Mahle


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#2663209 - 06/23/12 11:23 PM Re: My mechanic put 20w-50 in my car. [Re: vincent714028]
TallPaul Offline


Registered: 10/22/03
Posts: 13056
Loc: By Detroit
Hope he is not trying to cover up loose fitting bearings. But 20w50 should be no problem in Alabama in the summer.

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#2663216 - 06/23/12 11:31 PM Re: My mechanic put 20w-50 in my car. [Re: vincent714028]
JimPghPA Offline


Registered: 08/22/09
Posts: 2949
Loc: Pittsburgh,PA U.S.A.
I would leave the 20W-50 in it all summer and think about something like Rotella T-6 5W-40 or Castrol 5W-50 for winter.
_________________________
Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa


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#2663217 - 06/23/12 11:31 PM Re: My mechanic put 20w-50 in my car. [Re: vincent714028]
expat Offline


Registered: 05/12/09
Posts: 4426
Loc: Canada
Ask him WHY he proberbly paid more and put in a non mainstream oil like
20 w-50?

It won't do any harm, even in Canada, I once used this oil, year round, in a Toyota truck
And got very long engine life.

But the only reason why I think he might use it, is because he suspects the engine may be an oil burner.

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#2663222 - 06/23/12 11:36 PM Re: My mechanic put 20w-50 in my car. [Re: vincent714028]
LeakySeals Offline


Registered: 02/18/11
Posts: 5070
Loc: MA
Originally Posted By: vincent714028
It's a 94 camaro v8. A shadetree mechanic put a used engine with 160000 miles in my car. He filled it with Castrol GTX 20w-50. I think that is too thick and would like to try a thinner oil like 5w-30 since that is what is speced for my car.

I don't want to waste this oil so would it do any harm to leave it in for 3-5000 miles?


When you say specced for do you mean whats on the oil cap or dip stick? Thats a base recommended for all seasons. Take a look in your manual. What does it recommend for oil when temps are (for example) + 20 F?

Something like this?


I agree its not the best choice but it wont hurt it to leave it in and get your moneys worth. Does it burn any oil? Just blend it down topping off with some thinner oil.
_________________________
02 Camry XLE 2AZ-FE 305k M1 HM 5w30, 9k OCI.
13 Malibu 9k unknown..

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#2663223 - 06/23/12 11:37 PM Re: My mechanic put 20w-50 in my car. [Re: vincent714028]
TallPaul Offline


Registered: 10/22/03
Posts: 13056
Loc: By Detroit
You can drain out half the oil and save it for next OCI, then refill the half with 5w20. Will end up with somewhere in the upper end of the ballpark of 10w40.

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#2663228 - 06/23/12 11:49 PM Re: My mechanic put 20w-50 in my car. [Re: TallPaul]
daves87rs Online   content


Registered: 02/23/09
Posts: 14548
Loc: Michigan
Originally Posted By: TallPaul
Hope he is not trying to cover up loose fitting bearings. But 20w50 should be no problem in Alabama in the summer.


I was thinking that as well.
_________________________
“The Only Thing Necessary for the Triumph of Evil is that Good Men Do Nothing.”

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