My advice would be if you install an oil cooler and your engine oil temperature is already in check then I would not install an oil pan spacer as the extra quart of motor oil capacity will make your Z run cooler each set up is different. It really depends on how you use of your Z? I drive my Z hard sometimes and it sees severe duty street/strip/track so an oil pan spacer is essential for my set up. For street duty I doubt you will have clearance issues I never did but be careful. If you did hit something with your oil pan they are made of steel so they will bend. Most Z enthusiasts will recommend oil pan spacers for people how see strip/track/auto x events etc.
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