I was recently told by an automotive shop that they know of an issue with oil changes on WRX Turbo models. Not quite understanding what they are referring to but they mentioned that old oil remains in the Turbo section and unless one takes specific action to remove it, it poses a long term issue. They also mentioned that they also crank the engine without starting it to ensure that new oil flows into the oil filter and turbo. All for an additional charge of course. Has anyone seen or heard of this before? Is there a TSB out for WRX Turbo maintenance? Thanks.
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2002 Subaru Impreza
Question: Any known issues when changing oil?
Answer #1dandd April 02, 2009, 12:15Master
I work in a shop that does work on WRX vehicles, including oil changes. Any vehicle that has a turbo will keep a little oil in the turbo during an oil change, just like it keeps a little oil in the rest of the engine during an oil change. When you change the oil in ANY turbo vehicle, you always let it idle for a minute or so before you 'spool up' the turbo. The turbo will not really engage in a meaningful way until the rpms get over 2000 rpm. This is why there is a 'turbo lag'. Either this shop is inexperienced with turbo equipped cars such as Volvo, Mercedes, Mitsubishi, Toyota, Audi etc, etc, or they are just trying to reap some extra money for I don't know what. I have not seen any info about what this shop claims, on the on the professional technician websites. I just checked again.
I did check on the pro technician websites for info on this and found nothing.
Replyiquik2, April 02, 2009, 13:06Rookie
dand, thanks for your answer. It sounded suspicious to me. I've been doing my own oil changes and light duty maintenance on my WRX since new and this was the first time I've heard of this. I will try to get back to that shop to find out where they got that information and so-called advice from. Since you work in an automotive repair facility, you haven't found any thing from the Subaru TSBs regarding this type of oil change, right? I'm assuming you haven't otherwise you'd have mentioned it. Thanks again.
Answer #2patrick mannion from Greg Solow's Engine Room, April 02, 2009, 22:59Master
We also work on Subaru WRX no "special precautions". Totally agree with Dan.
There is .6 quart difference in the engine capacity between turbo and non turbo models.
You could disconnect the crank angle sensor and crank over the engine until you have oil pressure but you would set a code and have to erase the trouble code set using a scantool.
Use of a good quality oil and frequent changes are the important thing with turbo charged engines.