SM vs SL
- Thread starter Jim Allen
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So would it be safe to assume the use of a diesel oil or racing oil would be best for these engines?
How about HM oils? Do they have a higher level of the right stuff? I'm a big fan 5w-20 in my overhead cammed engines, but do prefure to use a 15w40 in my 350, 454, and 225 slant six although I have never done a UOA on any.
How about HM oils? Do they have a higher level of the right stuff? I'm a big fan 5w-20 in my overhead cammed engines, but do prefure to use a 15w40 in my 350, 454, and 225 slant six although I have never done a UOA on any.
It has also been brought up in another forum about SM oils and Zinc.
This is from a news letter:
"Some recent changes in oil and engine technology likely the cause of premature camshaft failure; here’s what you can do
Premature flat tappet camshaft failure has been an issue of late and not just with one brand or type of camshaft. In almost every case, the hardness or the taper of the cam lobe is suspected, yet most of the time that is not the problem. This growing trend is due to factors that are unrelated to camshaft manufacture or quality. Changes in today's oil products and “advanced” internal engine design have contributed to a harsher environment for the camshaft and a potential for failure during break-in. But there are several things you can do to turn the tide on this discouraging trend.
Proper Camshaft Set-Up & Break-In
Proper flat tappet camshaft set-up and break-in, as any engine builder knows, are keys to how long a camshaft will last, both short and long term. Making certain that the camshaft and lifters are properly lubricated will guarantee that the camshaft and lifters are protected during the critical initial start-up of your newly-built engine. COMP Cams® offers the right product for this job, Pro Cam Lube (Part #154), and it is available in several different size containers for engine builder convenience. To further enhance this “relationship,” we strongly recommend the use of COMP Cams® Camshaft Break-In Oil Additive (Part #159) during the break-in. While this additive was originally developed specifically for break-in protection, subsequent testing has proven the durability benefits of its long term use. This special blend of additives promotes proper break-in and protects against premature cam and lifter failure by replacing some of the beneficial ingredients that the oil companies have been required to remove from off-the-shelf oil. These specialized COMP Cams® lubricants are the best “insurance policy” you can buy and the first step to avoiding durability problems with your new flat tappet camshaft.
Adequate Lubrication
Another major factor in the increase of flat tappet camshaft failure is your favorite brand of engine oil. Simply put, today’s engine oil is just not the same as it used to be, thanks to ever tightening environmental regulations. The EPA has done a great job in reducing emissions and the effects of some of the ingredients found in traditional oils; however these changes to the oil have only made life tougher on your camshaft. The lubricity of the oil and specifically the reduction of important additives such as zinc and manganese, which help break-in and overall camshaft life, have been drastically reduced. In terms of oil selection, we recommend Shell Rotella T oil for the break-in procedure. Most often used in diesel engine applications, this higher lubricity oil works in gasoline engines as well.
Today’s engines are great at providing oil to every engine component except one - your camshaft. Windage trays, limiting oil’s ability to reach the top of the engine, modification of connecting rod side clearances for less splash oil and special oil pans further complicate both the break-in process and camshaft operation in general. But there are several things you can do to correct these problems."
EDIT- the newsletter has been updated:
Link
[ November 30, 2005, 12:33 PM: Message edited by: motorguy222 ]
This is from a news letter:
"Some recent changes in oil and engine technology likely the cause of premature camshaft failure; here’s what you can do
Premature flat tappet camshaft failure has been an issue of late and not just with one brand or type of camshaft. In almost every case, the hardness or the taper of the cam lobe is suspected, yet most of the time that is not the problem. This growing trend is due to factors that are unrelated to camshaft manufacture or quality. Changes in today's oil products and “advanced” internal engine design have contributed to a harsher environment for the camshaft and a potential for failure during break-in. But there are several things you can do to turn the tide on this discouraging trend.
Proper Camshaft Set-Up & Break-In
Proper flat tappet camshaft set-up and break-in, as any engine builder knows, are keys to how long a camshaft will last, both short and long term. Making certain that the camshaft and lifters are properly lubricated will guarantee that the camshaft and lifters are protected during the critical initial start-up of your newly-built engine. COMP Cams® offers the right product for this job, Pro Cam Lube (Part #154), and it is available in several different size containers for engine builder convenience. To further enhance this “relationship,” we strongly recommend the use of COMP Cams® Camshaft Break-In Oil Additive (Part #159) during the break-in. While this additive was originally developed specifically for break-in protection, subsequent testing has proven the durability benefits of its long term use. This special blend of additives promotes proper break-in and protects against premature cam and lifter failure by replacing some of the beneficial ingredients that the oil companies have been required to remove from off-the-shelf oil. These specialized COMP Cams® lubricants are the best “insurance policy” you can buy and the first step to avoiding durability problems with your new flat tappet camshaft.
Adequate Lubrication
Another major factor in the increase of flat tappet camshaft failure is your favorite brand of engine oil. Simply put, today’s engine oil is just not the same as it used to be, thanks to ever tightening environmental regulations. The EPA has done a great job in reducing emissions and the effects of some of the ingredients found in traditional oils; however these changes to the oil have only made life tougher on your camshaft. The lubricity of the oil and specifically the reduction of important additives such as zinc and manganese, which help break-in and overall camshaft life, have been drastically reduced. In terms of oil selection, we recommend Shell Rotella T oil for the break-in procedure. Most often used in diesel engine applications, this higher lubricity oil works in gasoline engines as well.
Today’s engines are great at providing oil to every engine component except one - your camshaft. Windage trays, limiting oil’s ability to reach the top of the engine, modification of connecting rod side clearances for less splash oil and special oil pans further complicate both the break-in process and camshaft operation in general. But there are several things you can do to correct these problems."
EDIT- the newsletter has been updated:
Link
[ November 30, 2005, 12:33 PM: Message edited by: motorguy222 ]
The article above is from Comp Cams and is in the magazine Power & Performance
[ December 01, 2005, 12:13 PM: Message edited by: motorguy222 ]
[ December 01, 2005, 12:13 PM: Message edited by: motorguy222 ]
Nothing for nothing but the quietest and smoothest my Toyota 1.8 has ever been was on Chevron SL..has always seemed to be more chattery with any type of SM oil including the SM Havoline I have in there now. I just trade a case of SM Hav for a case of SL today. I'm probably going to dump the SM Hav that is in there this weekend and put SL back in and see if it makes a difference. (only about 800 miles into this OIC)
Anal...yeah I suppose but isn't that why we are here
Goose
Anal...yeah I suppose but isn't that why we are here
Goose
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