Leak at oil filter cap

[petegtsv10]

Just did a seasonal oil change on my wife's F3 as I've done several other times. Initially, I didn't use a new O-ring for the cap and it leaked. So, I removed the cap and installed a new O-ring. Still leaks. I've tried tightening the cap very firmly and tried not tightening it so much. It's not a huge leak, but any leak is not acceptable. Any ideas what to look at next? (yes, I'm trying to avoid a trip to the dealer)

[BajaRon]

Just the usual. Check to be sure everything is clean, O-Ring, O-Ring seat on cap and filler tube. Make sure there are no nicks or cuts in the O-Ring. And, that the O-Ring is the proper size thickness and rubber/silicone compound. The O-Ring needs some lubrication. Clean engine oil works fine.

I suppose you should also check to be sure you're not overfilled. Unlikely. But a restricted crank case vent can push oil out in unexpected places.

Sometimes it is the simple things. Let us know what you find.

[petegtsv10]

Just the usual. Check to be sure everything is clean, O-Ring, O-Ring seat on cap and filler tube. Make sure there are no nicks or cuts in the O-Ring. And, that the O-Ring is the proper size thickness and rubber/silicone compound. The O-Ring needs some lubrication. Clean engine oil works fine.

I suppose you should also check to be sure you're not overfilled. Unlikely. But a restricted crank case vent can push oil out in unexpected places.

Sometimes it is the simple things. Let us know what you find.

Thanks for the response. I’m using the new O-ring from Lamonster’s kit. It looks like the old one. ( remember, the old one leaked after the oil change) I carefully measure the oil I drain and match it for the refill. I also did a proper check after the refill.I lubed O-ring with engine oil. I didn’t replace the 2 small O-rings....maybe that’s an issue. I’ll check surfaces for nicks tomorrow. Really frustrating for such a simple procedure.