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Old 12-30-2012, 08:51 PM
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cpllawncare cpllawncare is offline
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Location: Greenville, SC
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I have always heard not to switch from synth to conv but I did on my 05 F-150 am I in trouble?
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Old 12-31-2012, 02:21 PM
BillWil BillWil is offline
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Location: Central Michigan
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NO! When syn first came out people said that you shouldn't change over. I have done it on equipment and cars and trucks, both gas and disel. Never a problem.
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Old 06-19-2013, 11:56 PM
Pierre2013 Pierre2013 is offline
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Originally Posted by cpllawncare View Post
I have always heard not to switch from synth to conv but I did on my 05 F-150 am I in trouble?
You should be fine, tough I'm curious why you did that?

What happens when switching an old, or high mileage vehicle from conventional oil to synthetic oil is that the detergent in the synthetic oil will really clean up the inside of your engine and remove the sludge built up from using conventional oil. And sometimes, that sludge is the only thing preventing your seals from leaking.

In most cases, there won't be a leak, but it does happen.

In your case; you are going from a sludge free engine to using an oil which will create deposits over time. So you should be fine.
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Old 06-23-2013, 07:59 PM
MrNetvestor MrNetvestor is offline
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Location: New Jersey
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There is NO problem switching from Dino to Synth oil or Vice Versa.....

Also consider that in newer oils the zinc additive ZDDP has been reduced significantly to protect emission equipment in cars. This can have a detrimental effect on older / air cooled engines. I believe some of the "High Mileage" versions of oils come with higher amounts of ZDDP. You can also buy the additive from Lucas, GM and others.

Another factor to consider is break down at high heat and Flash Point. Many dino oils do better than synthetics in this category.

That said, I've used synthetics since the 80's and have never had any issues. IMO, their pluses outweigh their shortcomings.

PS: Many (if not most) "Synthetic" oils sold here in the US would not be considered synthetic in Europe. It's actually pretty tough to determine what is a "true" synth. Unless you know for sure what basestock is used and how it's blended you'll never know for sure.
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Old 06-24-2013, 10:21 AM
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Valk Valk is offline
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Location: Eastern KS
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This is only examining Mobil 1 products:

^^^ The main reason I use 15w-50 is the mineral composition breakdown. Have heard from other posters that they have been able to attain 15w-50 in gallon jugs...though I've YET to find them in my area.
~ cut it high ~ let it fly ~
Some folks are so contrary that if they fell into a river,
they'd insist on floating upstream.
~ Josh Billings
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Old 09-27-2013, 11:16 PM
tigerepairdotcom tigerepairdotcom is offline
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Join Date: Sep 2013
Location: duluth, ga
Posts: 319
JASO certified Oil

Another institute that certifies oils is called the Japanese Automotive Standards Organization, JASO.

I am a certified advanced Diagnosis technician for redmax Stihl and Briggs
2 stroke Redmax engines call for 2 stroke engine oil with JASO certification.
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Old 10-04-2013, 08:56 PM
joe billy joe billy is offline
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Good information guys....
Posted via Mobile Device
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Old 10-10-2013, 09:01 PM
Tdog123 Tdog123 is offline
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Location: The woods of FL
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So, new guy here, and there seems to be much debate as to which oil. I just bought a used Scag with low hours and am getting ready to change the engine and hydraulic oil. All the different thoughts/opinions can really cloud the decision process. My manual calls for 10w-30 in engine and 20w-50 in the hydraulics. Considering Rotella T 5w-40 for the engine and Mobil 20w-50 for the hydraulics. I'm sold on the Mobil 1 20-50should I stay with 10w-30 for the engine or will the Rotella T 5W-40 be ok. I'm in Florida with high temps. Choices, choices???
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Old 10-19-2013, 05:05 AM
Tdog123 Tdog123 is offline
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Location: The woods of FL
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Couldn't figure out how to edit previous post but, I went with the Rotella T6 5w-40. It has the JASO rating and it's on sale at Autozone for $105 for the 5 gallon bucket with a $25 rebate(limit 2). I picked up a couple as my Truck and Tractor are both diesel. Will be interesting to see if I can tell any difference in the mower/engine temps.
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Old 02-23-2014, 09:29 PM
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jakewells jakewells is offline
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Join Date: Feb 2014
Location: anywhere ky
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i use rotella t 5w40 so shoot me haha. never had a problem with it and change it every 75 hrs and always comes out clean.
2006 Gravely ZT 1840.
2007 Honda HRR2163TDA.
2014 Stihl MS 171.
2014 Stihl HT 101.
2013 Stihl BG 55.
2013 Echo SRM 225.
2014 Lone Wolf 5x8.
2001 Nissan Frontier

Small time guy who does it for families with a very low income.
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