91 oil question!
Thread Starter
Instructor
Joined: Feb 2003
Posts: 230
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From: Semmes Al
91 oil question!
Owners manual says must us SG grade oil. Mobil1 has SH SJ SL. In the last 15 years I know the oil has gotten alot better. Can I run Mobil1 without the SG rating. The Mobil 7500 has the old SG rating. Does SH SJ or SL mean that the oil is better than the ols SG rating?
Burning Brakes
Joined: Jun 2005
Posts: 861
Likes: 1
From: Hyde Park NY
St. Jude Donor '05
Found this on the Amsol site
II. API Class
The American Petroleum Institute (API) developed a classification system to identify oils formulated to meet the operating requirements of various engines. The API system has two general categories: S-series and C-series.
The S-series service classification emphasizes oil properties critical to gasoline or propane fueled engines. If an oil passes a series of tests in specific engines (API Sequence tests), the oil can be sold bearing the applicable API service classification.
There are ten S-series classifications: SA, SB, SC, SD, SE, SF, SG, SH, SJ and SL. The S-series classifications progress alphabetically as the level of lubrication performance increases. Each classification replaces those before it, with SL currently offering the most protection.
API Engine Oil Service Category Chart
Category
Status
Service
SL
Current
For all automotive engines presently in use. Introduced in July 2001.
SJ
Current
For 2001 and older automotive engines. Introduced in 1996.
SH
Obsolete
For model year 1996 and older engines.
SG
Obsolete
For model year 1993 and older engines.
SF
Obsolete
For model year 1988 and older engines.
SE
Obsolete
For model year 1979 and older engines.
SD
Obsolete
For model year 1971 and older engines.
SC
Obsolete
For model year 1967 and older engines.
SB
Obsolete
For older engines. Use only when specifically recommended by the manufacturer.
SA
Obsolete
For older engines; no performance requirement. Use only when specifically recommended by the manufacturer.
SL oil may be used in any engine, unless the engine manufacturer specifies a “non-detergent” oil. SA and SB are non-detergent oils and are not recommended for use unless specified.
SL oils are designed to increase fuel economy, reduce emissions and protect hot, hard-working engines over the course of a very long warranty period.
II. API Class
The American Petroleum Institute (API) developed a classification system to identify oils formulated to meet the operating requirements of various engines. The API system has two general categories: S-series and C-series.
The S-series service classification emphasizes oil properties critical to gasoline or propane fueled engines. If an oil passes a series of tests in specific engines (API Sequence tests), the oil can be sold bearing the applicable API service classification.
There are ten S-series classifications: SA, SB, SC, SD, SE, SF, SG, SH, SJ and SL. The S-series classifications progress alphabetically as the level of lubrication performance increases. Each classification replaces those before it, with SL currently offering the most protection.
API Engine Oil Service Category Chart
Category
Status
Service
SL
Current
For all automotive engines presently in use. Introduced in July 2001.
SJ
Current
For 2001 and older automotive engines. Introduced in 1996.
SH
Obsolete
For model year 1996 and older engines.
SG
Obsolete
For model year 1993 and older engines.
SF
Obsolete
For model year 1988 and older engines.
SE
Obsolete
For model year 1979 and older engines.
SD
Obsolete
For model year 1971 and older engines.
SC
Obsolete
For model year 1967 and older engines.
SB
Obsolete
For older engines. Use only when specifically recommended by the manufacturer.
SA
Obsolete
For older engines; no performance requirement. Use only when specifically recommended by the manufacturer.
SL oil may be used in any engine, unless the engine manufacturer specifies a “non-detergent” oil. SA and SB are non-detergent oils and are not recommended for use unless specified.
SL oils are designed to increase fuel economy, reduce emissions and protect hot, hard-working engines over the course of a very long warranty period.
