I currently have 10W40 Mobil1 in it. No leaks whatsoever at 5200 miles, and have read excellent write-ups on the "euro blend" 0W40. I've had excellent performance with 0W40 in small block 351W SPF, and a 302 crate motor in the CAV GT40. I'm getting ready to finally hook up an Accusump that's sitting on the rail but not plumbed, so I'm thinking of using the 8 qts of 0W40 I have in the garage, with the cooler weather and very little useage over the winter...any thoughts?
