Forum

[SteveT2]

Any recommendations for the correct oil grades for a 63 Interceptor Mk1? Mono? Multigrade?
Thanks

[Bullet Whisperer]

20/50 for engine, gearbox, primary case and forks will be fine.

[Mark M]

What Paul says. If you want you can use ATF Type F in the primary and forks, I do on my Mk1 and think the primary in particular benefits but others see no improvement. I also use a Hypoid gear oil in the gearbox, the Mk1 has a bushed mainshaft sleeve which can be troublesome, and for that reason I'd use something more modern. An alternative would be multigrade with a dash of Molyslip or similar friction reducer. Whatever you do, do not use monograde in the engine! There is a group for Interceptors, https://groups.yahoo.com/neo/groups/RE_Interceptor/info You will have to apply for membership as it is a closed group and this usually takes a few days. Got any pictures?

REgards, Mark

[SteveT2]

Thanks for the comments👍, I’ll try and post some pictures soon...

[Aethelric]

There is an interesting article on oils here It's all about Norton Commandos but the technology is similar to the Interceptor, or a Bullet even.

[another Allan]

I was going to mention Jim Comstock's test results, but you beat me to it!


Generally, any flat-tappet (i.e. not roller tappet) engines need higher levels of ZDDP than most modern oils contain.

[Aethelric]

Most of the oils he mentions are not available in the UK. Castrol Classic comes up well though so that's what I have kust got for next oil change.