Rob MidgleyOils and Oil Analysis

deHavilland Moth Club

Agenda Piston Engine Oils.

– Break in Procedure.– Multigrades.– W100 Plus.– Preservative Fluids.

Installation /Operation Tips Oil Analysis Q & A

AeroShell Oil Straight Grades

Viscosity Grades: 65, 80, 100 & 120

Specifically Selected Mineral Base Oils

Approved SAE 1966 former Mil-L-6082

Used Mainly For Break-in. Speciality Applications.

Break in Procedure.

PISTONRING

TOP OF PISTON

PISTON RING GROOVE

CYLINDER WALL

FILM OFLUBRICATING OIL

Break in Procedure.

PISTONRING

BMEPCYLINDER WALL

FILM OF

LUBRICATING OIL PISTON RING GROOVE

Break in Summary Use good quality oil of the correct type. Avoid long periods of ground running. Use full power for take off and up to 500 ft

agl. Maintain 65% - 75% cruise power and fly

below 8000 ft amsl. Advance to full power for 30 sec every 30 min

in cruise. Avoid long low power let downs. Keep CHT ‘in

the green’ Be generous with mixture and and cooling air.

Break in engines run hot.

AeroShell Oil W Grades

What does the stand for ?

Ashless Dispersant Oils

What is in the Oil? Base oil Anti-oxidants

Improves the oxidative stability of the oil Metal Passivators

Dispersants Keeps contaminants, such as soot, in suspension

Pour point depressants Improves the low temperature flow properties

Anti-foam Helps the release of trapped air

Viscosity index improvers Improve the viscosity characteristics of the mineral

multigrades

Single Grade Vs Multi Grade

MG Better for Cold Start MG Leaks Better MG Runs Cooler MG Reduce Oil Consumption Past

the Rings Neither a SG or a MG or Even an

Additive will Fix a Broken Engine

What is a Multigrade?

The viscosity of all oils varies with temperature - the higher the temperature the lower the viscosity.

The viscosity of an oil has an influence on it’s load carrying ability and ability to be pumped.

Monogrades consist of mineral base oils with relatively poor viscosity / temperature characteristics. Therefore Monograde oils must be selected to suit the conditions.

Multigrades have been developed to reduce the variation of viscosity with temperature.

AeroShell Oil W 15W-50

Semi-synthetic Premium Multigrade Approved SAE 1899 former Mil-L-

22851 Anti-corrosion, Anti-wear Best Low Temp Performance Reduces Fuel & High Temp Oil

Consumption, Oil Temp, Wear & Rusting

Recommended for Cold Climates and Temperature Extremes

Not recommended for large Radials.

AeroShell Oil W 100 Plus

AeroShell Oil W100 Plus

SAE 50 monograde to SAE-J-1899. Standard Additives Plus an anti-wear

additive, a corrosion inhibitor and a metal passivator.

Why? Prevents scuffing, helps limit oil

oxidation and inhibits the start of corrosion.

Some applications prefer monogrades. Not a Preservative / Storage Fluid.

AeroShell Fluid 2F Preservative Fluid for Aviation

Engines. MIL-C-6529E Qualified. Based On Blend of AeroShell Oil

100 and AeroShell Fluid 2XN. Fly Away Oil, up to 50 Hrs

between TBO cycles.

Oil Change Interval Procedure

Every Four to Six Months max. Every 50 hrs (if completed in less

than 4 months) Every 25 hrs without a Filter (if less

than 4 months) Change Oil Before Storage Use a Preservative Oil for Long

Storage Periods

Operation Tips

Do Not Just Start up & Idle Check Crankcase breather. Operate With in Guidelines (Warm

up etc.) Operate Every 2 Weeks if possible Check Filters & Screens Look for

Change

Engine Installation Checklist

Calibrate Tachometer & Gauges Check Oil Lines Check Baffles and Seals Break-in on Proper Oil Follow Recommended Speeds and

Loads For Initial Flight Change Oil after 15-20 hrs and

again after 25 Additional hrs.

Questions & Answers