I'm sure this has been answered 1000 times but I can't find it...
I have recently built a small block GT186 motor, my first build and all is running well but the clutch slips a little when you give it the beans. It currently has a Surflex 4 plate clutch that's been in for a few years so I decided to upgrade to a Readspeed 5 plate clutch as they seem to get good reviews.
However, sitting on the side at after 4pm on a Friday (great timing) I currently have a new bottle of ST90 gear oil but Readspeed recommend SAE30. I'm not an oil expert, I guess this is to do with viscosity but of course being the weekend I want to get on with it and I doubt I will buy that in Halfords... plus I have the new bottle of ST90 already purchased, less what went in when the build was finished last week before discovering the clutch slippage.
Can someone more knowledgeable than I tell me whether this is just a recommendation or if it's essential to correct operation? I don't want to mess things up obviously but would prefer not to have to wait another week if it's not essential. Being a bit of a shed numpty spanner twiddler I don't fully understand or appreciate the difference/importance.
Thanks.