2007 Impreza, exactly 188k miles. This spring weather has me feeling a little froggy, so I decided to go crazy on the old girl.
Out: full D&F (12 quarts worth in a 10qt system) Valvoline MaxLife ATF. The ML was fine when warmed up, but when below maybe 10*F ambient and cold starts, the trans would SLAM the first time it went to shift to 4th gear if you’re really into the gas. Also, occasionally when at the very lower RPM limit of OD (30-35 mph), it would occasionally have a 1-2 sec shudder. Hoping the new fluid will fix both conditions.
In: 3 gallons by D&F, HPL Green CC. Talked with Dave Stoiber about compatibility, and he said since I was already on MaxLife, the very small viscosity difference to the OEM isn’t an issue, so I decided to go for it.
First impressions: Obviously it’s warmer than when then trans would bang on ML, but I immediately noticed smoother engagements of each gear. The ML shifted extremely quickly, the fastest and most positive I’ve ever seen a stock slush box. The HPL is still very quick but just barely softer. Will see how things progress as the fluid cleans from the inside out!
Did not change the filter, since OEM filters are essentially considered lifetime and I changed the OEM out for a pre-2020 Napa Platinum. I know the efficiency isn’t super high, but the synthetic wire-backed media will last. I figure it’s around 40-50k miles in use.
I may decide to toss a new spin-on on it when I add the external trans cooler in a few weeks. We’ll see how the mood strikes me
EDIT: went out and put about 20 miles on the new Green CC. It’s definitely less abrupt than ML on the shifts (which is odd, since a couple 10R80 users reported very hard shifts with the CC); I kinda like it so far.
I’ll obviously have to wait awhile to see how it performs in cold weather compared to ML. However, this is still May in the Midwest, so we could always have snow again by Thursday…