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#27616 - 05/20/03 11:27 AM 10w30 in the summer, 10w40 in the winter? Is that ok?
billyman Offline


Registered: 05/20/03
Posts: 1
Loc: Nashville, TN
I have been changing my own oil since 1988 (18 y/o w/a 1979 Chevy Van). Then I went to a '90 Cavalier Z24, then a '94 Gran Prix, then a '90 240SX, '01 Olds Alero and now a '00 Max.

All this time I have been of the mindset: 10W30 in the winter, 10W40 in the summer. Living in TN, I always liked the thought of offering better protection by switching to the thicker oil in the summer.

Should I continue this practice? Or modify it? You thoughts & comments please.

Thanks in advance.

[ May 21, 2003, 02:28 AM: Message edited by: billyman ]

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#27617 - 05/20/03 12:06 PM Re: 10w30 in the summer, 10w40 in the winter? Is that ok?
Dominic Offline


Registered: 07/04/02
Posts: 1791
Loc: Gilbertsville, PA
I don't see the advantage of such a practice so long that the 30 is enough viscocity. You don't want too little or too much, and only an analysis can tell you whether a 30 or 40 is better for summer/winter.

I run 10W-30 no matter what right now. I have heard running 10W-40 can cause a car to never run right on 10W-30 later on, but again these are rumors and are not likely true [Smile] Looking at your situation, it appears they aren't at least.

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#27618 - 05/20/03 12:20 PM Re: 10w30 in the summer, 10w40 in the winter? Is that ok?
Flimflam Offline


Registered: 01/18/03
Posts: 453
Loc: Galveston, TX
quote:
Originally posted by Dominic:


I run 10W-30 no matter what right now. I have heard running 10W-40 can cause a car to never run right on 10W-30 later on, but again these are rumors and are not likely true [Smile] Looking at your situation, it appears they aren't at least.

From 1999 to mid- 2002, I used 10w-40 regardless of season or weather, regardless hot or cold. From mid-2002 to December 2002, I used straight grade HD-30 mineral oil in hot summer weather and 5w-30 in cold winter weather. For my next oil change, I will pour in either 10w-30 or 10w-40. My car is 38,500 miles and 4 1/2 years old.

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#27619 - 05/20/03 01:55 PM Re: 10w30 in the summer, 10w40 in the winter? Is that ok?
Patman Offline



Registered: 05/27/02
Posts: 19403
Loc: Oakville, Ontario
I would say pick a good 5w30 or 10w30 synthetic and stick with it year round. No need for 10w40 with your car, the clearances most likely are tight enough that 40wt oil is too thick for best engine wear.

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#27620 - 05/20/03 10:33 PM Re: 10w30 in the summer, 10w40 in the winter? Is that ok?
troy_heagy Offline


Registered: 07/31/02
Posts: 179
Loc: Forest Hill MD
quote:
Originally posted by billyman:
10W30 in the winter, 10W40 in the summer.

Tennessee has winter?!?!? You could probably run 10W-40 all year round. Just make sure it's a synthetic.

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