Hi can anyone recommend a engine oil an grade semi or part thanks

For the last 10 years i use Castrol 10w60 and i never had problems with the engine or the turbos...running 12-14 psi

 

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fully synthetic...

I use either Castrol GTX 10W 40 semi synthetic or Mobil 1 Super 2000 10W 40 semi synthetic. I do between 15K - 20K miles a year in my 93 TT Zed and change the oil and filter every 3K and it runs a treat.

I've been using valvoline max life part synth 10-40 in mine recently. Stopped my front seal oil leak. Engine seems happy (100,000 plus miles on it now) the last 2 people to service it "forgot" to change the seal. I'll do it myself next time.

I'm using Castrol Edge 5W-40 fully synthetic now and it's running well. I do notice the oil pressure is dropping more at idle, nearly to 1kgf/cm² as opposed to 2kgf/cm² previously (don't know what oil was in it). I believe 10W-30 is recommended but it's very hard to get here.

recommended is 10 40 semi

I just use 10/60 mobil 1 fully synthetic I see how I get on to the next oil change

recommended is 10 40 semi

 

According to this it's 10W30 for moderate climates: http://www.300zx-twinturbo.com/cgi-bin/manual.cgi?list=ma&dir=&config=&refresh=&direction=forward&scale=0&cycle=off&slide=11&design=default&total=33