My moms Golf needs an oil change soon. Its been run with Castrol Syntec 5w-40 since we got it a few years ago. Most Vw guys I know only run 5w-40 and say to run nothing else in these motors, but Wally world has a good deal on a 5L jug of 5w-30 Syntec and they don't have it in 5w-40. So I'm wondering if I can get away with running syntec 5w-30 all winter?
Thanks
Thanks