90-93 300Ds are more completely known as 300D 2.5 turbo. All have the same 5cyl 2.5l turbocharged OM602.
The 87 300D and TD have the 6cyl 3.0l turbocharged OM603.960. The 86-87 300SDL has the 6cyl 3.0l turbocharged OM603.961. The difference between .960 and .961 seems to be the cover of the oil filter canister and the throttle linkage. The 90-91 350SDL and 91 350SD have the 6cyl 3.5l turbocharged OM603.970.
Sixto
... stay tuned
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