mig25 Posted July 16, 2003 Share Posted July 16, 2003 I am about to start using MOBIL 1 FULL SYNTHETIC MOTOR OIL in my LS400 1990 with 130.000 Miles. Could it pose any problems? Should I keep using conventional oil instead ? Link to comment Share on other sites More sharing options...
Bubbles Posted July 17, 2003 Share Posted July 17, 2003 No. I just switched to mobil 1 on my sc300 with 130000 miles. It's been 200 miles since and nothing wrong yet. The only problem with mobil 1 is that it costs a lot and the Lexus website says that they don't recommend switching back to conventional after synthetic has been used. Also if you use Mobil 1 make sure you used a good oil filter or else there's no point in using Mobil 1. My auto tech teacher also told me that if you want some performance gain, change all other fluids to synthetic if possible (manual transmissions can use synthetic oil, same with differential). By the way, I just went to Costco and they sell Mobil 1 a case of 6 for $24. That's $4 a quart. Not bad. Link to comment Share on other sites More sharing options...
m2pc Posted July 18, 2003 Share Posted July 18, 2003 I am going to switch as well. So what mileage intervals are you going to change oil at? Link to comment Share on other sites More sharing options...
Bubbles Posted July 18, 2003 Share Posted July 18, 2003 I'd do 4000 miles. People say do the 3000 mile change, but this is synthetic and it costs a lot. 4000 shouldn't clog up the oil filter would it now. And the Lexus sc300/sc400 repair manual says to do an oil change @ 7000 miles if driven nicely and @ 3750 if driven severely(i.e. stop/go traffic, heavy loads on engine). I remember reading a website (could be a bogus one), that tells you to drain and refill oil and oil filter after 2000 miles from the first synthetic oil change. That means if you switched to synthetic at 120 000 miles, then at 122 000 miles you should do an oil change. I'm guessing this is because synthetic cleans all that gunk from conventional oil and gets dirty real quick. Link to comment Share on other sites More sharing options...
yucaton_tom Posted June 11, 2004 Share Posted June 11, 2004 I also am considering changing to Mobil 1 Syn at 190K miles on my 93LS. What viscosity do you all recommend? Take into account this is Houston, Texas where it seldom gets below 40F. Summertime average is about 95F. Thanks Link to comment Share on other sites More sharing options...
steviej Posted June 11, 2004 Share Posted June 11, 2004 mobil 1 10w-30 synthetic as stated in a reply to your same post in a different thread. I am going to close this thread since the responce prior to yours was over a year ago and this will only start a duplicate discussion. steviej Link to comment Share on other sites More sharing options...
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