Help your car run better with this one easy trick!
 

Hi All,

You have your car pretty well sorted; it runs well, but maybe not quite a smooth as you know it can. You go on the hunt for some old vacuum lines, maybe you find one that is old and a bit hard so you replace it or cut off the old end... But, still, just not Nirvana...

So, let me ask you a personal question... How does your oil cap come off? Does it go on ok, but then is difficult to get off? Is it not really obvious when it seats? Well, I have a $3 remedy that will outlast any snake-oil fuel treatment... Go to our host and do a search for a replacement O-ring seal for your oil cap. Just throw it in your project list and add it to your next order. You'll be sooo happy you did!

Sorry about the silly title, but I just replaced that little seal and OMG what a difference! It runs so smoothly now and it is more responsive. My cap would seat but then be just about impossible to remove. Not to mention it was getting stuck on the dip-stick. When I pulled out the old gasket, it felt like hard plastic and was smaller in diameter than the replacement. I put in the new gasket and screwed the cap on and I could feel it settling down in all its sealy goodness. Ahh... Nirvana... The idle is so smooth and power delivery is even and constant.

One simple little trick...

Franny

For future reference,

part#: 930-107-272-01-M100
Oil Cap Seal, 911 (1973-77), 911 (1978-86) with bayonet style cap, 911 Turbo (1976-77), 911 Turbo (1978-86) with bayonet style cap

part#: 999-701-846-40-M17
Oil Cap Seal, For Threaded Style Cap, 911/911 Turbo (1986-89)

Thanks Will for the actual part numbers. I should have added that.

Franny

My oil cap is a very personal and private topic. Lets not overshare. ;)

Lol :)

No, thanks for sharing. It makes sense. If the cap doesn't seal, you'll have a vacuum leak and our cars are at that age where we are all hunting sources of vacuum leaks. I never thought about the oil cap seal. At $3, it would be dumb not to replace.

With the old seal the cap would screw in too far and would get caught on the dip-stick. When I went to remove it, it would get caught and I had to work it back and forth to get it release the dip stick. Very frustrating... It comes right off now...

f