Is there any evidence that charger seals are degrading because of oil type? Usually blowing from pressure spikes.
*opens can of worms quietly*
My question to Opie Oils is, instead of recommending a random oil (which they stock) has any testing been done to warrant the recommendation, if so what?
If is hasn't (which I suspect not) then what basis is the product being recommended on?
Regarding the oil pressure spikes- I've never seen any conclusive evidence (high speed pressure transducer traces pre-chrager) of oil pressure spikes on the rev limiter.
The pressure relief valve is open at this point anyway, any excess pressure (3.5bar +???) is vented to the sump. Oil pressure fluctuates when each lobe forces oil into the gallery, so you have a natural sine wave anyway.
If you're overcoming the PRV (i.e choking the relief) then oil pressure can rise sure and any fluctuations are seen directly on components.
I've not done any testing myself, but I'd have thought rapid speed fluctuations or excessive oil pressure would be more the problem rather than oil pressure fluctuations. Happy to be educated though