I have a 1990 245 wagon that just clocked in at 340,000. I have owned and maintained the car since 2000 and have been using Mobil 10w-40 High Mileage (conventional oil). They are making it more and more difficult to find the stuff so I thought about switching over to Mobil1 10w-40 Fully Synthetic for High Mileage Vehicles. Right now the ONLY issue with the motor is the rear cam seal and valve cover gasket (they are original).
What suggestions do you have as far as:
1) Should I bother switching?
2) How to properly switch without causing leakage problems?
3) Does anyone have any experience with the rear cam seal?
(I have the Volvo seal AND valve cover gasket)
4) I just don't want to mess up my car! :-(
Thank you ALL in advance.
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