Hi,

I have read some old threads saying that mobil1 is good and cleans well, others that say it balooned up the rubber and messed things up. I use it inthe locker on my chevy truck, and it works great. However that has a gasket that must be replaced every time the fluid is changed. My question is does the rear on a 123 car have a gasket? If so, will the mobil1 leak through, or is it such high viscosity that diffusion through any gasket would be negligible? Also, am I safe draining the fluid, putting mobil1 in and then driving it for a year? I can imagine the suspended particles will have a wearing effect, especially at high concentrations. I dont knwo the last time the fluid was changed, but I dont currently have the time to replace it twice in a short time.
Any info would be great. Thanks

JMH