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Quick question: is 10W-30 too thin?


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i've always done what you're thinking, 10W-40 between march-november and november-march i go with 10W-30, now does it actually do anything or help i don't know but thats what i've been doing for the past 3 years, before that it was always 10W-40 all year round.

 

-my winters are around 31 degrees at their lowest point and the hottest point in summer is around 115degrees F.

btw i just changed to 10W-30 yesterday on one of my Subies to get ready for "winter" if thats what you want to call it here in Texas.

Edited by Subasaurus
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31 isn't cold. One advantage of synthetic is that it doesn't overly thicken when cold. Once it's running, your engine is at 190 with a stock thermostat. The coldest I sometimes see is -15 here. Before I had a garage the synthetic makes a small difference in cranking speed in the morning. Having the largest battery that fits in the space, and 5 years or less age probably matters more here. The usual cross reference charts point to a battery a size or 2 smaller than I run.

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 Im currently running 10W-40 Valvoline High Mileage Blended Syn. I am going to be doing an oil change pretty soon and I was gonna go with Valvoline 10W-30 High Mileage Full Synthetic for my winter oil.Thoughts? Concerns? 

 

Look here for Answers: ~► http://www.ultimatesubaru.org/forum/topic/126284-how-to-determine-which-is-the-best-motor-oil-for-your-car/

 

There's a Scan from Subaru information by the end of that writeup.

 

I agree with Nipper, you should stick to 10W~40 all year round.

 

Kind Regards.

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