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Can anybody tell me what are the different effects of oil grades (including synthetics) on different types of Z's. What is the recommendation for a high mileage z (250,000kms) and an L28et (rebuilt). Thanks
 

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I have 225+ kms on my 81 280zx. I just changed entirely over to sythetic. It has helped soooooo much. Better than conventional [If your Z doesn't drip at all]. Synthetics small molecules make leaks bigger. I put Mobil 1 10w30 in the engine, and Pennzoil 75w90 in the tranny and diff. Shifting improved greatly, immediatly! Plus it cleans better than conventional oil. That's my recommendation.
 
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