What oil to run in my 1987 T/A...72,000 with no major leaks..Summer car..I run only AMSOIL...Thinking of 10-w40? What do you think?

Also anyone know what amsoil filter this is or have the amsoil filter guide for all cars?

thanks
Aj

 

The 10W30 is fine. I use it or the 0W30 in my vehicles. Since you say it is a summer-only car, you may want to consider the 15W40 heavy-duty diesel and marine oil - it has extra corrosion inhibitors for when it's in storage, and is rated for gasoline engines as well as diesels.

For filters, go to www.amsoil.com/products.htm, click on the "Oil & Filter Search" button. Use Internet Explorer, though (or some reason, it doesn't get along well with Netscape). SDF25 is the "normal" listing, which is the shorter case. I use the SDF24 oil filter on Chevy V8's when length isn't a problem.

 

TA87,

5-7 is right on it. If you are using Amsoil (a premium synthetic) there is really little difference in the thermal characteristics of the two lubricants. Without getting into one of my usual tirades on synthetics and their properties, if you do a little research into the cold-flow and viscosity indicies of both products, you'll see it's probably virtually the same for cold pumping and lubrication, and the 10W-40 will be a little better on the hot end - but only a little. Either one is far superior to any mineral oil, so you almost can't lose either way. You're already providing the best lubrication you can, and now you're down to the "tweaking" for personal preference. I'd lean toward the 10W40, but it'sa your call.

Personally, I use Mobil 1 15W50 in my summer cars. It's probably no better or worse than AMSOIL, but just seems to be a little more commonly available. A Mobil 1 synthetic filter is a good choice with any synthetic engine lubricant, but they can be pricey little *******...

BTW - I'm using "Nutscrape" and the Amsoil site works fine for me. Maybe I'm just lucky?