As I believe I have mentioned in the past I have an interest in Harleys as
well as Triumphs. Harley Davidson sell their own oil which has the high
additive levels of the pre-catalytic convertor era oils. HD also suggest
Diesel-type oils (C type) as the next best alternative to their own oil. I
wouldn't be rushing to your local HD dealer though as the stuff costs
around $6 per quart!
Many riders on the Harley lists do not use HD oils and have had no problems
with automobile oils and synthetic oils as alternatives. I suspect that as
long as you change oil frequently and use the vehicle regularly that any
brand name oil will do. YMMV
I have read that the main problem with diesel emissions is the high carbon
particle output (smoke I presume) and not the NOx compounds that gasoline
engines pump out. I recall the European commission was going to recommend
that diesel vehicles filter their emissions rather than use a catalytic
convertor. The may not have proceeded with this, my information dates from
when I lived in the UK (7 years ago)
Regards
Neil
69 Triumph TR6
73 Triumph Spitfire MkIV
98 Harley XL1200S
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