Extra 300/SC - Page 112

CHAPTER 12
PAGE 8
MAINTENANCE MANUAL EXTRA 300/SC
PAGE DATE: 1. August 2014
condition, the switch to additive oil should be deferred until
after engine has been overhauled.
When changing from straight mineral oil to additive oil take
the following precautionary steps:
I M P O R T A N T Do not mix additive oil and straight mineral oil. Drain
straight mineral oil from engine and fill with additive
oil.
Do not operate engine longer than five hours before
again changing oil.
Check oil screen for evidence of sludge.
Change oil and clean oil screen element every 10 hours if
sludge is evident. Resume normal oil drain periods after
sludge conditions improve.
Recommended Viscosity of Engine Oil:
Average Ambient
Air Temperature
MIL-L-6082 or
SAE J1966 Spec.
Mineral Grades
MIL-L-22851 or
SAE J1899 Spec.
Ashless Dispersant
Grades
All Temperature ----------
SAE 15W50 or
SAE 20W50
Above 27°C (80°F) SAE 60 SAE 60
Above 16°C (60°F) SAE 50 SAE 40 or SAE 50
-1°C (30°F) to 32°C (90°F) SAE 40 SAE 40
-18°C (0°F) to 21°C (70°F) SAE 30
SAE 30, SAE 40 or
SAE 20W40
-18°C (0°F) to 32°C (90°F) SAE 20W50
SAE 20W50 or
SAE 15W50
Below -12°C (10°F) SAE 20
SAE 30 or SAE
20W30
N O T E Refer to latest revision of Lycoming Service Instruc-
tion No. 1014 for further information.