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| | | | Joined: Jan 2006 Posts: 43 Member | | Member Joined: Jan 2006 Posts: 43 | if synthetic oil was used in my truck on the last oil change do I need to keep using it? | | | | | Joined: Jul 2006 Posts: 707 Shop Shark | | Shop Shark Joined: Jul 2006 Posts: 707 | Heck, no, if you don't want to. But you can go longer between oil changes with synthetic.
1951 3800 Be the change you want to see. -hotshoe
| | | | | Joined: Nov 2006 Posts: 21 Junior Member | | Junior Member Joined: Nov 2006 Posts: 21 | If the truck has had synthetic oil in it for a long time, I'd recommend continuing to use it. The problem with switching between petroleum based oil and synthetics is that the engine seals become saturated with whatever you are using and may develop leaks if you switch. This is more common when switching TO a synthetic oil, but the same principle applies both ways. If you are not running an oil filter (as in the case of many old stovebolts) you probably won't realize any benefit from synthetics since you must change the oil much more frequently. I've been running Shell Rotella T in my 235 which was a recommendation I got here. It has worked out great and is comparable in price to other petroleum based oils.
I wouldn't recommend drugs, alcohol, and violence to anyone...but they've worked well for me.
| | | | | Joined: Dec 2006 Posts: 184 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 184 | I'd agree with the above post. If you have been running synthetic for any length of time, I'd stick with it. I run synthetic in my 98 truck, but I put a lot of miles on it for work. In my bolt I run straight weight 30 because I can't find the 20 that's spec and 30 weight is fine in this desert environment.
Do you run a straight weight synthetic? Were do you find it? I've seen all multi weight blends and I was taught that straight weight oils are better for these older engines. Just curious. | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Royal Purple is the only company that I've found that produces synthetic oil in a straight weight. I'm planning on changing over to synthetic myself, I've alredy swapped the tranny and diff to Lucas synthetic ant I have noticed a difference in the performance, especially in the trans.
Bill Burmeister
| | | | | Joined: Feb 2007 Posts: 513 Shop Shark | | Shop Shark Joined: Feb 2007 Posts: 513 | i have a 1994 chevy with 350, used mobile 1 synthetic since new in 1994, 195,000 miles later it purs like a kitten and runs exellent tons of power, my brother has a 1989 chevy with 175,000 miles with a 350, always ran regular- the motor leaks a little and doesn't feel as strong or depenable
1949 Chevy 3600 Flatbed all orginal 1964 gmc 4000 1973 gmc 6000 2005 chevy duramax 4x4 1994 chevy 1500 Trucks are GM and Tractors are Orange "I don't measure a man's success by how high he climbs but how high he bounces when he hits bottom." - General George S. Patton | | |
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