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I am planning to switch to Mobil 1 oil / Pure One filter at 8k miles with Regal GS. Just to be sure concerning the break-in. Changed oil at 2k and 5k with what oil/filter Firestone and dealer put in.
I am already using Pure One filter and Mobil-1 oil with my 98 Malibu. They are practically always available at my local Pep Boys. Learned late about synthetic, and started to use them toward the end of warranty, at about 35 k miles. Had only two changes with Mobil-1.
Now the car is approaching 40k miles. GM recommends to do transmission service at 50k miles with severe driving conditions (Connecticut is a hilly place), and never with ideal conditions. I decided to do it now, either at Chevrolet dealer or Firestone, and to switch to Mobil synthetic fluid. Though, do not know what filter.
AC Delco produces three kinds of filters: simple mesh screen, paper, and top-of-line composite:
but they have no catalog on-line for transmission filters. Hard to know, if all three kinds of filters are available for the Malibu (or other specific cars) and where to buy. Other manufacturers, like Hastings, offer one filter for Malibu.
Now, this is not a Type-S, so the power is a bit less at 225hp. However, I don't think there are any Type-S drivers getting into the 13's at the track with a near stock engine. On the other hand, here's a bunch of GTPs and a Regal with those honors:https://secure.westserver.net/motorsports/menu_13_sec_club.htm
It doesn't take much to push a stock GTP or Regal into the 13 second club, and with some extra goodies, you'll be racing Vipers in the 12's. Better start looking at roll bars!
I had read before about the fluid capacity at GM site
(this is about Malibu, but the same with other transmissions). But it never came to me to flush the transmission. To the best of my understanding, without flush I will have a blend of new synthetic fluid and the old one. About 50/50 after the first change... To be more precise, 7l/12.5l = 56% synthetic to 44% dyno.
On the other hand, if the natural oil based fluid is good enough for 50k miles even with severe service conditions, and up to infinity in light service, probably this does not matter so much. The 56% of synthetic is any case better than 100% dyno. Even more, than after the second service 80% of fluid will be synthetic, and 91.5% after the third one. Then the car will have 100k on odometer, 8 year old or so...
So I will ask around about the transmission flush: availability, prices, etc. And how often they do the flush, how much experience. Probably better to have the service without flush at good place than with flush at "quick lube".
As to checking fluid level after service, this is very good idea.
Always need to check tire pressure. Every second time have to adjust to my preference, and once was way off high (inflated to the sidewall value!).
Used to check oil level too, but in my experience there was no problem except slight over filling - about 1/2 qt. excess - roughly every second time. This is no problem with me.
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