Join Date: Jun 2000
Location: CT/ Long Island Sound
Thanked 30 Times in 29 Posts
Rep Power: 16
The guy at NAPA knows cars and trucks (or perhaps not), but is not likely familiar with marine diesels. The loads on marine engines and the way they are used (constant load, short duration) are different from the situation on the road. Any sae 30 oil will work in your engine, but if Volvo calls for a specific brand or type beyond that, it's because they've determined their engine will work better (longer, cooler, etc.)) with what they've specified. Ask your mechanic or Volvo to see if there's an updated list of approved lubricating oils for your engine, since 1972 was a while back. Our Yamaha specifies a funky-named oil that even in some marinas they have to dig out from the back- but they have it, because they're dealing with boats.