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Can I replace Castrol Valvemaster with Miller's VSP Power Plus in my 1967 Triumph 2000?

I run my 1960 Standard Vanguard using Miller’s VSP Power Plus as a lead replacement additive. I have now acquired a 1967 Triumph 2000 which has been run using Castrol Valvemaster Plus. Can I safely replace this with the Miller’s product?

Asked on 25 August 2012 by JW, via email

Answered by Honest John
The Vanguard has an extremely tolerant four cylinder engine that has been run on almost anything when fitted to Ferguson tractors. There was even a diesel version, as well as some fairly powerful tuned engines in TR2 and TR3 race and rally cars. So while both additives should both work, I'd stick with what the straight six Triumph engine is used to. No point in tempting fate.
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