is it ok to use regular oil and regular gas in an ML430?. If 'no'..why not?
The engine is a high compression and was designed to accept Synthetic and 91 or better octane. You will sacrifice MPG and introduce more wear to the engine and sludge.
regular oil, yeah, reg. fuel if you don't mind feeling the engine pre-detonate go for it...
I would use the synthetic oil and use a fuel with an octain rating of 91 or higher. It will just make your car run better, sound better and make the engine life last longer.
as of why, the less expensive fuel, does not burn as fast the engine is designed to detonate combustion at a specified time, and it will make it delayed hurting fuel mileage. and can clog the filter. the synthetic oil is thinner, and the ports the oil travels are small, so the faster it travels, the faster it lubricates preventing engine wear...the most damage to an engine happens when it is first started....with frequent or regular oil changes it won't make a difference with regular or synthetic/.
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