Author Topic: Motor oil question? 91 318is (Read 3133 times)

Bimmer805 · « **on:** February 15, 2011, 10:27:43 AM »

Can changing from regular oil to synthetic cause a oil leak? ive been hearing this and i want to know if its true or not?

cristimm · « **Reply #1 on:** February 15, 2011, 11:14:57 AM »

Yes it is true.

Bimmer805 · « **Reply #2 on:** February 15, 2011, 11:52:57 AM »

how can i make it stop leaking?

mr.vang · « **Reply #3 on:** February 15, 2011, 05:04:36 PM »

synthetic oil is thinner and can leak through bad seal, crack ects. the only way to stop the leak is fix what ever seal, gasket ect is bad.

DesktopDave · « **Reply #4 on:** February 15, 2011, 07:51:38 PM »

I changed mine to synthetic and it kept on leaking. This motor is about the sloppiest one I've ever owned, and that's saying something.

I'm thinking about switching to RLI biodegradable lubricants next time, so at least I won't be poisoning the world with my lubricants.

They're right, new seals are the best bet. Or, more economically, just put some cardboard under the car. Think of it as a built-in rust prevention system.

Bimmer805 · « **Reply #5 on:** February 15, 2011, 10:37:47 PM »

where will it commonly leak at?

JoeDellio · « **Reply #6 on:** February 15, 2011, 11:48:47 PM »

Dino oil will work just fine.

mr.vang · « **Reply #7 on:** February 16, 2011, 03:13:35 AM »

Quote from: Bimmer805;101537

where will it commonly leak at?

front and rear crank seal, oil filter housing, oil pan lower and upper gasket..

Bimmer805 · « **Reply #8 on:** February 16, 2011, 11:59:11 AM »

Quote from: mr.vang;101548

front and rear crank seal, oil filter housing, oil pan lower and upper gasket..

where is the front and rear crank seal located at? is it hard to replace?