Anybody using Driven brand HR-2 oil in their slant?

slantsixdan said
That oil's fine. I'd pick the 5W30 version, but this is fine. I'd also use the larger 1515 filter instead of the smaller 1068, but again, the 1068 is fine. There is nothing to worry about in what you're doing about oil and filter.

Dan, I checked the NAPA site, and they say the 1515 filter won't work on my 1974 slanty. Any idea why? Thanks.