Rob Midgley Oils and Oil Analysis deHavilland Moth Club

Agenda n Piston Engine Oils. –Break in Procedure. –Multigrades. –W100 Plus. –Preservative Fluids. n Installation /Operation Tips n Oil Analysis n Q & A

AeroShell Oil Straight Grades n Viscosity Grades: 65, 80, 100 & 120 n Specifically Selected Mineral Base Oils n Approved SAE 1966 former Mil-L-6082 n Used Mainly For Break-in. n Speciality Applications.

Break in Procedure. PISTON RING TOP OF PISTON PISTON RING GROOVE CYLINDER WALL FILM OF LUBRICATING OIL

Break in Procedure. PISTON RING BMEP CYLINDER WALL FILM OF LUBRICATING OIL PISTON RING GROOVE

Break in Summary n Use good quality oil of the correct type. n Avoid long periods of ground running. n Use full power for take off and up to 500 ft agl. n Maintain 65% - 75% cruise power and fly below 8000 ft amsl. n Advance to full power for 30 sec every 30 min in cruise. n Avoid long low power let downs. Keep CHT ‘in the green’ n Be generous with mixture and and cooling air. Break in engines run hot.

AeroShell Oil W Grades n What does the stand for ? n Ashless Dispersant Oils

What is in the Oil? n Base oil n Anti-oxidants ( Improves the oxidative stability of the oil ( Metal Passivators n Dispersants ( Keeps contaminants, such as soot, in suspension n Pour point depressants ( Improves the low temperature flow properties n Anti-foam ( Helps the release of trapped air n Viscosity index improvers ( Improve the viscosity characteristics of the mineral multigrades

Single Grade Vs Multi Grade n MG Better for Cold Start n MG Leaks Better n MG Runs Cooler n MG Reduce Oil Consumption Past the Rings n Neither a SG or a MG or Even an Additive will Fix a Broken Engine

What is a Multigrade? n The viscosity of all oils varies with temperature - the higher the temperature the lower the viscosity. n The viscosity of an oil has an influence on it’s load carrying ability and ability to be pumped. n Monogrades consist of mineral base oils with relatively poor viscosity / temperature characteristics. Therefore Monograde oils must be selected to suit the conditions. n Multigrades have been developed to reduce the variation of viscosity with temperature.

AeroShell Oil W 15W-50 n Semi-synthetic Premium Multigrade n Approved SAE 1899 former Mil-L n Anti-corrosion, Anti-wear n Best Low Temp Performance n Reduces Fuel & High Temp Oil Consumption, Oil Temp, Wear & Rusting n Recommended for Cold Climates and Temperature Extremes n Not recommended for large Radials.

AeroShell Oil W 100 Plus

n SAE 50 monograde to SAE-J n Standard Additives Plus an anti-wear additive, a corrosion inhibitor and a metal passivator. Why? n Prevents scuffing, helps limit oil oxidation and inhibits the start of corrosion. n Some applications prefer monogrades. n Not a Preservative / Storage Fluid.

AeroShell Fluid 2F n Preservative Fluid for Aviation Engines. n MIL-C-6529E Qualified. n Based On Blend of AeroShell Oil 100 and AeroShell Fluid 2XN. n Fly Away Oil, up to 50 Hrs between TBO cycles.

Oil Change Interval Procedure n Every Four to Six Months max. n Every 50 hrs (if completed in less than 4 months) n Every 25 hrs without a Filter (if less than 4 months) n Change Oil Before Storage n Use a Preservative Oil for Long Storage Periods

Operation Tips n Do Not Just Start up & Idle n Check Crankcase breather. n Operate With in Guidelines (Warm up etc.) n Operate Every 2 Weeks if possible n Check Filters & Screens Look for Change

Engine Installation Checklist n Calibrate Tachometer & Gauges n Check Oil Lines n Check Baffles and Seals n Break-in on Proper Oil n Follow Recommended Speeds and Loads For Initial Flight n Change Oil after hrs and again after 25 Additional hrs.

Questions & Answers