My understanding is on the 95 940s,, the flame trap is buried under the intake manifold. I have used mobil one synthetic since I got the car.. I have only 55K miles on it and it runs great..just leave it alone???or clean it for preventative reasons..???? Seems hard to get at. Also at what interval would you change differential fluid...??? Do it now?? Thanks again guys..especially Steve and Abe.. regards..john

On the 95 940 the flame trap is near the valve cover between intake runners 3+4. It attaches to the oil separater with a hose 4-5" long. You don't have to go under the intake to replace.

It's not really "buried": you can easily pull it out by hand from above, using the curved vacuum hose fitting on the top of the trap. Pull off the smaller vacuum line on the side, then just pull it up. Even with synthetic, you may find a little crud, but in all honesty, none of my cars have ever had a problem with a clogged flame trap. All use Mobil 1.

I changed my differential fluid at around 60k, replacing it with Mobil 1 85-90. There was no detectable wear in the old fluid and I plan to leave the synthetic in there for good.

Hi If it is the same as my 86 740, it is indeed buried under the intake manifold. It is reachable, but you have to reach in there with your hand and figure out how to take it out carefully. Been there, done it, and it worked fine. I would suggest taking a look at the Brickboard's Maintenance Hints (edited by Steve Ringlee) I think there are good instructions and diagrams there. Also RPR Board. Good luck. When I pulled mine apart it was perfectly clean, just a little greasy, but not blocked up at all.