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1/2 Delvac 1 5w-40
1/2 delvac 1300 15w-40
Delvac 1300 has a bit of moly, delvac 1 keeps stuff slean, both are compatible mobil products using the same additive packages, so there is no chance of additive clash.
I have tried allthe oils, I have found that delo 400 and rotella give the worst MPG. Pennzoil longlife and delvac 1300 arent much better. Delvac 1 gives reproducible 29-31 MPG (vs 27-28 with the others), but is quite expensive. Doing the mix gives reproducible 29-30, and works great in my 83 300D.
JMH
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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)
Past Diesels:
1983 300D (228K)
1985 300D (233K)
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