Originally Posted by Miller88
Originally Posted by JosephH1
Hi, I have an oil burning 2017 Subaru Forester (2.5i, 82k miles, non turbo, on it's second short block, STILL burning 1 qt every 1,000 miles). A friend tried a thicker oil (0w-40) and cut oil consumption by 50%. My question is what impact a thicker than spec oil may have on the variable valve timing components? I do not want ease one problem and cause a 2nd problem. Should I be worried about a heavier oil and VVT? I am considering switching to a High Mileage oil at this point. TIA!
I may or may not have ran a 0w-40 through my 2018 with the same engine. Not because I'm having oil consumption, but because I got a bunch of it for $1 a quart. I did notice once the temperature started to cool off last fall, I started having some weird "chugging" at part throttle until the oil temp came up. As soon as I changed out to the recommended 0w-20 , it was fine again.
Of course, this is all hypothetical, because I always stick to the MFR recommendation while under warranty
Also, because mine is a manual transmission, there may be different tuning to make it meet emissions.
I have the manual transmission as well. Of course this is hypothetical, as we all follow MFR recommendations during the warranty. Of course, I am not planning to eventually run anything radical, likely a high mileage oil in xw-30 or xw-40, maximum. Or maybe a low SAPS to try and save the converter.