November 17, 201510 yr 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?
November 18, 201510 yr 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 November 18, 201510 yr by Subasaurus
November 18, 201510 yr 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.
November 18, 201510 yr 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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