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Thank you for the suggestions. I reached out to Cotton's and Jack immediately responded to my email. It looks like he'll be able to get me get it figured out.

Hello, I'm trying to learn more about the turbo the previous owner put on my 87 GN. It has a gold housing that has a sticker on it that says "Turbonetics Turbochargers T-17814". Doing a google search yields absolutely nothing on the turbo. Is anyone familiar with this turbo? Are their...

Thanks to everyone for their feedback on the topic of oil. It surely made for a lively discussion. :) I emailed a few manufactures through their websites to get their take on the oil to use. I advised I had a modified 87 GN that gets driven 5,000 miles a yr and sees a few trips to the drag...

Thanks for all the great feedback. Has any one sent virgin oil in for an analysis and then performed a used oil analysis to see the effects the engine and turbo is having on the oil? It's seems a lot of you like the heavier weight oils. Is that because they are shearing down a grade when in...

Thank you for the feedback. Are you doing 3,000 mile change intervals?

Greetings Everyone, I'm new to the Buick Grand National scene but not to the turbos or collecting cars for that matter. I recently picked up an 87 Grand National that has a little work done to it. The seller ( a local classic car retailer) claims it's putting down 400 hp. Searching...