Recently did the head gaskets in g/f's '07 Impreza. This is the normally aspirated 2.5L boxer motor, not the WRX turbo. Anyway, the oil and coolant leaks are now gone (bottom of the engine is bone dry after a 4,000 mile cross country trip from Florida) but it did use about 2 quarts of oil during that time. And before anyone asks, the PCV valve is brand new. So, even though Subaru calls for 5W-30 in this engine (I've been using Valvoline Max-Life 5W-30), does anyone think it would be worthwhile trying some Rotella T6 (or other XW-40) to try and slow down the consumption? Or is this a bad idea? The car is driven on a 30 mile round-trip commute at freeway speeds daily, and will be in the Seattle area, so maybe an occasional sub-freezing start-up, but nothing sub-zero.
Rotella 5W-40 in an '07 Subaru Impreza?
- Thread starter Mike242GT
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Originally Posted By: 05LGTLtd
T6 is pretty stout for a NA ea 2.5. You could run it, but I'd suggest M1 0w-40 or edge 0w-40 for a heavier than 5w-30 option.
Also drop 3oz of TWC-3 2 cycle in each tank if you want a smooth boxer experience.
Mike,
I had an 06. I used Castrol, M1 and T6.
My BEST results was with M1. I base this from MPG and oil consumption. I too had the HG problem at 110K. Traded it for a new car. prior to this, M1 5w30 gave me the best results. 1/2 qt consumption every 3.5K. Castrol was 1 qt.
T6 might be great for turbo motors, but NA will not benefit from it.
My EJ felt like it was pulling an anchor with it in the sump.
FWIW, you cannot go wrong with any good synthetic 5w30 for an NA.
Maxlife 5W-30 is a great oil. But, if you want to try something a bit thicker, why not try their Maxlife 10W-40...
I tried T6 in a number of cars (Jag, Saab, VW) and was never really please with the results. I do not have any Subraru experience... I did have good luck with it in a Beemer.
I'm switching to Maxlife from HDEO's for some of the fleet. I think it's a really good starting point 
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