Marcus ,
I assume you are using 5.50 x 16 (175x16) Michelin X tyres ,
I'm not a tyre expert but suggest you TRY them up to about 32psi on front and 34psi on rear .
Why do you want to stick with the Vokes filter assembly with the twin pipe outlets ?
It is not original for the 400 .
Even if you can source a suitable element the sealing of the element to the alloy housing is not always successful , it relies on the spring pushing the canister on to the alloy housing . If the top plate of the canister is not perfectly flat it can not seal correctly.
I found when I switched to a spin on filter my oil remained cleaner for much longer , pointing that the filter was working more efficiently than the ones in the Vokes assembly.
What 400 do you own ?
Could you please advise the chassis number ?
Regards
Geoff
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