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What fluids should I never mix in a Japanese car?

Never mix: different engine oil brands (completeness), universal green coolant with OEM-specific red/blue/pink, DOT 3 brake fluid with DOT 5 silicone-based fluid, standard gear oil with LSD fluid (friction modifier required), automatic transmission fluid between different OEMs (specifications vary). Always check your service manual or use OEM-specified fluids.

Next: plan the move

Found the car. Understand the handover.

Before making promises about collection, coordinate the inspection, paperwork, seller release and transport. Give each part of the purchase its own check.