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2008 Lexus RX 350 Base FWD 4dr



Questions & Answers

A: Premium fuel?

I understand the ramifications of anyone actually telling me that using any fuel other than what is recommended by the manufacturer, especially in a public forum like this, could be professionally and personally disastrous! So I probably should not have even asked the question. I do recall the dealership person telling me the reason other fuels would work is that these vehicles have to operate in many different countries and the 'computer' will adjust the engine to handle some pretty bad stuff. There is no doubt that performance would suffer. How much and in what way is what I was trying to determine. Based on his advice I did run 'regular' fuel through my GS300 for 70,000 miles. The only noticeable problem was a part of the fuel system had to be cleaned more than it should. My gas mileage was better than most people were getting with the same model. I am neither a 'lead footed' driver or a 'little old lady', which led me to think the type of fuel didn't have much effect on the mileage. The service writer for my car basically said that the cleaning of that part (sorry I do not remember what is was) more than scheduled would cost me more than the extra I would have paid for the gas. So in the end, I guess premium it is! Thanks

Mechanic Q: Premium fuel?

The RX calls for premium fuel, as do most Lexus vehicles now. I have been given conflicting advice from Lexus dealers about whether you can actually use lower octane fuel. One has taken the party line that if the owners manual says it...use it. The other worked for one of the largest and oldest Lexus dealers and had been with them for many years. He said premium gas will generate premium performance, but unless you are planning on racing there was no need for premium fuel. The only thing he said was not to change the type of fuel you use. He further stated that EVERY car they delivered was filled with regular gas! Your thoughts please.

Q: Use of premium fuel?

The RX calls for premium fuel, as do most Lexus vehicles now. I have been given conflicting advice from Lexus dealers about whether you can actually use lower octane fuel. One has taken the party line that if the owners manual says it...use it. The other worked for one of the largest and oldest Lexus dealers and had been with them for many years. He said premium gas will generate premium performance, but unless you are planning on racing there was no need for premium fuel. The only thing he said was not to change the type of fuel you use. He further stated that EVERY car they delivered was filled with regular gas! Your thoughts please.