Is there any problems and/or benefits by mixing a qt. of synthetic 5W-30 with 4 qts. of regular dino 5W-30 for better winter starting?
or is buying the blended synthetic better in the long run?
quote:Mobil recommends when using the Supersyn for the first time after running a conventional oil to do a regime of 2-3 short change intervals at roughly 2-3k miles because of it's cleaning abilties. They further that " Exxon/Mobil Enginners are wary of conventional oils that tout their use of additional seal-swelling agents. With extended use these agents can over-soften engine seals,resulting in leaks. More to the point,and oil additive will not rejuvenate worn or damaged seals". I tend to believe Mobil on both of the above My personal opinion is there would be no harm in spiking Mobil Drive Clean with a synlube like Amsoil 10/30 or Conoco Syncon 10/30,,maybe even spike the Drive Clean Blend a little. Do it at your own risk though because I will not be held responsible
Originally posted by red2rebel: They went so far as to say you had to flush the engine of all remnants of dino oil before adding synthetic or else you'll sieze.
quote:Me too. Good post.
Mobil recommends when using the Supersyn for the first time after running a conventional oil to do a regime of 2-3 short change intervals at roughly 2-3k miles because of it's cleaning abilties. They further that " Exxon/Mobil Enginners are wary of conventional oils that tout their use of additional seal-swelling agents. With extended use these agents can over-soften engine seals,resulting in leaks. More to the point,and oil additive will not rejuvenate worn or damaged seals". I tend to believe Mobil on both of the above
quote:I would say you would not see any benifit from 1 qt. If you want better cold weather starts, you need to use a 5W-30 or 0W-30 oils, either synthetic (better) or pertoleum. Back in the old days (70's) we would add a quart of synthetic oil to petroleum oil to help clean the engine (synthetic are high detergent) crankcase before switching over to complete synthetic. But the are crankcase cleaners now that make this not worth it. [ February 08, 2003, 12:30 PM: Message edited by: Mike ]
Originally posted by Roadking: Is there any problems and/or benefits by mixing a qt. of synthetic 5W-30 with 4 qts. of regular dino 5W-30 for better winter starting? or is buying the blended synthetic better in the long run?
quote:*** I've read conflicting posts regarding this issue, mostly pertaining to whether they were high mileage vehicles or not. Thanks Again !!!!!
Originally posted by red2rebel (with some modifications): Again, From my Pa, Back in the '80s it was "understood" that you couldn't mix synthetic and dino oils, ... that it caused breakdown of the viscosity to the point you are running on practically water. They went so far as to say you had to flush the engine of all remnants of dino oil before adding synthetic or else you'll sieze. **** Was this FACT or FICTION or MYTH ???**** Can you just go to an oil change facility and say "change to synthetic" without negative repercussions? Or do you have to have the engine steamed / flushed first? Same thing for the tranny. Can you just switch at the drop of hat?